I am getting below error in my DC.

The Knowledge Consistency Checker (KCC) has detected that successive attempts to replicate with the following directory service has consistently failed.
Directory service:
CN=NTDS Settings,CN=CCUDC60SAT,CN=Servers,CN=SAT-USA-Hub,CN=Sites,CN=Configuration,DC=ccu,DC=,DC=com
Period of time (minutes):
The Connection object for this directory service will be ignored, and a new temporary connection will be established to ensure that replication continues. Once replication with this directory service resumes, the temporary connection will be removed.
Additional Data
Error value:
8451 The replication operation encountered a database error.

I see in AD SITES AND SERVICES Under connection it has all connections so how should I repair and what should I do
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Kamal KhaleefaInformation Security SpecialistCommented:
Check replication pairs in site and services and using which link for each
pramod1Author Commented:
please elaborate
Kamal KhaleefaInformation Security SpecialistCommented:
Usually this error comes if replication link broke or low speed connection between dc's

For each site replication there is the configuration to use which link and which sites replicated together
Check what dc has this issue 'replication error and try replicate it by choosing replicate site option
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pramod1Author Commented:
what is this 8451 error then? is it database error if yes then which dc the source dc or problem with replicating with other dc's
Kamal KhaleefaInformation Security SpecialistCommented:
Its db error because of replication error
RantCanSr. Systems AdministratorCommented:
The number of minutes indicated is 6 and a half years. Has this ever properly replicated?

According to the error, there is an something wrong with your AD coming in. Are there any 2003 DCs in your domain?

You can further diagnose the error with repadmin.exe /showrepl run from the DC in question.
pramod1Author Commented:
where are you getting this figure from (number of minutes indicated is 6 and a half years)

yes we have 2003 dc
pramod1Author Commented:
to rant can

what is The number of minutes indicated is 6 and a half years?
pramod1Author Commented:
what could be the problem with 2003 dc
RantCanSr. Systems AdministratorCommented:
Yes? My math could be off...
pramod1Author Commented:
can reboot help
pramod1Author Commented:
so you mean to say it has not replicated to ccudc60sat for 6 yrs?
Seth SimmonsSr. Systems AdministratorCommented:
what is this 8451 error then?

this is (at least) the third time you have asked about this 8451 database error
i have pointed to this kb article numerous times which you have accepted as a solution yet you keep asking about what it is and what to do

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pramod1Author Commented:
I am getting error
Internal event: Active Directory Domain Services has encountered the following exception and associated parameters.
Additional Data
Error value:
Internal ID:

do I need to go for offline defrag
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